Jquery JTable 错误

Question

An error occured while communicating to the server.

<script type="text/javascript">
$(document).ready(function () {
    //Prepare jtable plugin
    $('#ProjectTableContainer').jtable({
        title: 'Project Management System',
        paging: true,
        pageSize: 10,
        sorting: true,
        defaultSorting: 'projectName',

        actions: {
            listAction: '/administrator/ADMProject.aspx/ProjectListByFilter',
            createAction: '/administrator/ADMProject.aspx/ProjectCreate',
            updateAction: '/administrator/ADMProject.aspx/ProjectUpdate',
            deleteAction: '/administrator/ADMProject.aspx/ProjectDelete'
        },
        fields: {
            projectId: {
                key: true,
                create: false,
                edit: false,
                sorting: false,
                list: false
            },
            projectName: {
                title: 'Project Name',
                width: '20%',
                create: true,
                edit: false,
                sorting: true,
                list: true
            },
            projectDescription: {
                title: 'Description',
                create: true,
                edit: true,
                sorting: false,
                list: true
            },
            projectStartDate: {
                title: 'Date Started',
                type: 'date',
                create: false,
                sorting: false,
                edit: false,
                list: true,
                displayFormat: 'yy-mm-dd'
            },
            projectEndDate: {
                title: 'Date Ended',
                type: 'date',
                create: false,
                sorting: false,
                edit: false,
                list: true,
                displayFormat: 'yy-mm-dd'
            },
            userName: {
                title: 'Owner',
                create: true,
                edit: false,
                list: true,
                options: '/administrator/ADMProject.aspx/GetUserName'
            },
            projectCreated: {
                title: 'Date Created',
                width: '8%',
                type: 'date',
                create: false,
                edit: false,
                list: true,
                displayFormat: 'yy-mm-dd'
            }
        }
    });
    $('#ProjectTableContainer').jtable('load');
});
    </script>

有什么问题？我找不到它的任何地方。我一直得到 "An error occured while communicating to the server."